Perspectives are different frameworks from which to explore the knowledge around sustainable sanitation and water management. Perspectives are like filters: they compile and structure the information that relate to a given focus theme, region or context. This allows you to quickly navigate to the content of your particular interest while promoting the holistic understanding of sustainable sanitation and water management.
This well assorted document gives you a great overview about the Integrated Fixed Film/ Activated Sludge (IFAS) Technology.
BRENTWOOD (2009): Integrated Fixed Film/ Activated Sludge (IFAS) Technology. Reading: Brentwood Industries, Inc. [Accessed: 16.04.2019] PDF